I guess this is technically the world's first consumer quad-core x86 SoC. Haswell will come in a single-chip solution as well but only as a dual-core part. Kabini needs no companion platform/IO controller chip, everything is integrated on this single piece of silicon. There are also two GCN compute units in there.
I'm sure AMD will have more accurate numbers shortly, but using my completely unimpressive calipers I measured the die at 10.35mm x 10.35mm (107mm^2). I figure the actual number will be somewhere in the range of 104 - 112mm^2. AMD's 40nm Zacate by comparison (Brazos platform) was a 75mm^2 die, but that's not including the Hudson FCH (Fusion Controller Hub) which was around another 28mm^2. If you add those two up you get roughly the die area of a quad-core Kabini. The beauty of Moore's Law is that although die sizes may be similar, Kabini is appreciably quicker than Zacate.